665884395 has 48 divisors (see below), whose sum is σ = 1305787392. Its totient is φ = 322846560.

The previous prime is 665884381. The next prime is 665884423. The reversal of 665884395 is 593488566.

It is a happy number.

It is not a de Polignac number, because 665884395 - 2¹⁷ = 665753323 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11547 + ... + 38276.

It is an arithmetic number, because the mean of its divisors is an integer number (27203904).

Almost surely, 2^665884395 is an apocalyptic number.

665884395 is a deficient number, since it is larger than the sum of its proper divisors (639902997).

665884395 is a wasteful number, since it uses less digits than its factorization.

665884395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49854 (or 49842 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The square root of 665884395 is about 25804.7359025432. The cubic root of 665884395 is about 873.2386423794.

The spelling of 665884395 in words is "six hundred sixty-five million, eight hundred eighty-four thousand, three hundred ninety-five".